Seven is a backport of the default Drupal 7 administration theme (designed by Mark Boulton and Leisa Reichelt). This is simply that theme made compatible with D6 for anyone who wants to start using it now. For more information about the theme itself, visit Mark and Leisa’s Drupal 7 site at http://d7ux.org

Nerdalistic A mix of Google and Wordpress ideas and colors in an easy to use and configure layout.

Specifically designed for making administration tasks clearer and easier to navigate, Polpo uses a fluid two column layout ideal for content editing on larger screen resolutions. This is achieved through the use of larger font sizes, clearer spacing and distinct colours to aid the usability of common tasks.